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/* { dg-do compile } */

/* { dg-options "-O2 -fdump-tree-optimized -fdump-tree-reassoc-details" } */

extern int a0, a1, a2, a3, a4;

int f ()

{

int b0, b1, b2, b3, b4;

  /* this can be optimized to four additions... */

  b4 = a4 + a3 + a2 + a1 + a0;

  b3 = a3 + a2 + a1 + a0;

  b2 = a2 + a1 + a0;

  b1 = a1 + a0;

  /* This is actually 0 */

  return b4 - b3 + b2 - b1 - a4 - a2;

}

/* { dg-final { scan-tree-dump-times "Reassociating by rank" 3 "reassoc" } } */

/* { dg-final { scan-tree-dump-times "return 0" 1 "optimized" { xfail *-*-* } } } */

/* { dg-final { cleanup-tree-dump "optimized" } } */

/* { dg-final { cleanup-tree-dump "reassoc" } } */